Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d522582c5a833d9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 19:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8ffa3b84f5e2a6882a35dc09f7a8e6b SHA-1: edef7681021c2a6b2a84fe29a72a45eda7c91c72 SHA-256: 6d522582c5a833d96b5bd85a1e36ff643307330074a129788b77e132ad92158b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into clicking through to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4597

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=ssc+gd+constable+syllabus+pdf+2018 PDF link annotation
    • http://isotope3.pm-ural.com/uploads/files/38164377366.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/65123434587.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/873ea80265dbcc1bd2989e80b42c5f43/wozegatavufudogupiv.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/53057281603.pdfIn PDF document text
    • http://moneymaker-gold.de/files/93024600623.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/5214061473.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/19754292209.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gimidupuzurilogozenagebo.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/vulisutipuxovitafe.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109021229079968.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/gadudalugubezej.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/53790669886.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/7726747277.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/54859985984.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130688ca1554---63529546538.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/52571404530.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/pimekurakavuzixujowil.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/8152861687.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/34760358490.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/tisas.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/88362480447.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/fojujogedelinul.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331a5e440d1---58750581771.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/46260113460.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/32908987127.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 17488 bytes
SHA-256: ca274e50e04bae53760a08b43cb92267d66d46fb9e31b35bebfa1109eef1a9b1
font_01_sfnt_off00012a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1